What is x when 30 divided by x equals 9?

To find the answer, just divide the dividend by the quotient: 30 ÷ 9 = 3.3333333333333

To prove this, let's compute 30 divided by 3.3333333333333: $\frac{30}{3.3333333333333} = 9$

How does it work?

Asking what the value of x could be when 30 divided by x gives a result of 9, is equivalent to solving the following equation:

$\frac{30}{x} = 9$

Multiply both sides by x: $\frac{30 x}{x} = 9 x$
$\frac{30 x}{x}$ is equivalent to $\frac{x}{x} \times 30$ , which simplifies to $1 \times 30$ (or just $30$ ).
Thus, the equation becomes: $30 = 9 x$
To find x, divide both sides by 9: $\frac{30}{9} = \frac{9 x}{9}$
Which gives, after simplification: $3.3333333333333 = x$ (or $x = 3.3333333333333$ )

So, if the dividend is 30 and the quotient is 9, the divisor is 3.3333333333333.